It utilizes the iPhone's built in accelerometer and microphone to track the data.
The most basic ones are equipped with an accelerometer, which measures motion to collect data activity, steps and sleep.
Aside from the accelerometer, it has the ability to constantly monitor your heart-rate for several days on end!
The accelerometer climbed higher and higher, and he felt as though he could hardly move his hands to the proper switches.
But I wasnt really to find out what that accelerometer was for until I used it.
I knew that the accelerometer was to indicate the force of the pull-outs.
At eight thousand feet on the altimeter I shifted my gaze to the accelerometer and horsed.
For an instant, the accelerometer hovered at twelve G, and slipped toward thirteen.